Method to control increase in viscosity during aging of siloxane modified polymers
AssigneeBridgestone Corporation
InventorsTerrence E. Hogan, Chen-Chy Lin, William L. Hergenrother
Life of this patent
Estimating the term…
Abstract
A method for controlling any increase in Mooney viscosity during aging of siloxane-functionalized polymers includes the step of adding a viscosity stabilizing effective amount of a long chain alcohol preferably selected from the group consisting of aliphatic, cycloaliphatic, and aromatic alcohols having more carbon atoms than the hydrolyzable substituent on the siloxane end groups. The method provides for the stabilization of Mooney viscosity of siloxane-functionalized polymers at any given level upon aging. The long chain alcohols react with the siloxane-functionalized polymers prior to hydrolysis of the siloxane end groups to form moisture stabilized polymers.
Claims20
A method for stabilizing the Mooney viscosity of a siloxane-terminated polymer having at least one hydrolyzable substituent on the siloxane end group by reacting the siloxane-terminated polymer, after the polymerization but still in the presence of an inert solvent, with a viscosity stabilizing effective amount of a long chain alcohol, prior to contacting the polymer with water.
A moisture stabilized polymer comprising the hydrolysis reaction product of a siloxane terminated polymer having at least two hydrolyzable substituents reacted with a long chain alcohol, wherein said long chain alcohol has more carbon atoms than the hydrolyzable substituents, and wherein at least a portion of the hydrolyzable substituents remain in the reaction product.
The moisture stabilized polymer comprising the hydrolysis reaction product of a siloxane terminated polymer reacted with a long chain alcohol, wherein said long chain alcohol is selected from the group consisting of multi-hydroxy fatty acid esters of hydrogenated and non-hydrogenated C5 and C6 sugars and branched aliphatic alcohols.
Dependencies are inferred from the claim text.